Partitions of Nitrogen and Sulfur between CaO-AI2O3 Melts and Liquid Iron

Abstract

Nitrogen and sulfur distribution ratios between CaO-AI203 slags and Fe-0.0001-33mass%AI alloys were measured in the temperature range of 1 823 to 1 923 K, using an Al203 and CaO crucibles. The distribution ratios under a CaO crucible were higher than those under an Al2O3 crucible, and increased with an increase of Al content. Nitride and sulfide capacities defined by CN3- = (mass%N). P and CS2- = (mass%S) - P, respectively, which were obtained by using the reported values for activity of Al203, agreed well with those directly measured in a gas-slag experiment under an Al203 crucible, but disagreed with those under a CaO crucible. Activities of Al203 in the CaO-AI2O3 melts saturated with CaO were evaluated based on the results in the gas-slag experiments. © 1991, The Iron and Steel Institute of Japan. All rights reserved.